WO1998039871A3 - Adaptation of pre-equalisers - Google Patents

Adaptation of pre-equalisers Download PDF

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Publication number
WO1998039871A3
WO1998039871A3 PCT/US1998/004251 US9804251W WO9839871A3 WO 1998039871 A3 WO1998039871 A3 WO 1998039871A3 US 9804251 W US9804251 W US 9804251W WO 9839871 A3 WO9839871 A3 WO 9839871A3
Authority
WO
WIPO (PCT)
Prior art keywords
equalizer
coder
output
feed forward
adaptive
Prior art date
Application number
PCT/US1998/004251
Other languages
French (fr)
Other versions
WO1998039871A2 (en
Inventor
Stanley K Ling
Ping An
Hiroshi Takatori
Original Assignee
Level One Communications Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Level One Communications Inc filed Critical Level One Communications Inc
Priority to AU66850/98A priority Critical patent/AU6685098A/en
Priority to EP98908943A priority patent/EP0965207A2/en
Priority to CA002283200A priority patent/CA2283200A1/en
Publication of WO1998039871A2 publication Critical patent/WO1998039871A2/en
Publication of WO1998039871A3 publication Critical patent/WO1998039871A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/38—Synchronous or start-stop systems, e.g. for Baudot code
    • H04L25/40—Transmitting circuits; Receiving circuits
    • H04L25/49—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems
    • H04L25/497—Transmitting circuits; Receiving circuits using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels ; Baseband coding techniques specific to data transmission systems by correlative coding, e.g. partial response coding or echo modulation coding transmitters and receivers for partial response systems
    • H04L25/4975—Correlative coding using Tomlinson precoding, Harashima precoding, Trellis precoding or GPRS
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
    • H04L25/03019—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception
    • H04L25/03057—Arrangements for removing intersymbol interference operating in the time domain adaptive, i.e. capable of adjustment during data reception with a recursive structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L2025/03592—Adaptation methods
    • H04L2025/03598—Algorithms
    • H04L2025/03681—Control of adaptation
    • H04L2025/037—Detection of convergence state

Abstract

Adaptive equalization methods used with precoded systems dominated by inter-symbol interference (ISI) is disclosed. The adaptive equalizers monitor the output of a DFE and compare it to a reference for updating a pre-coder in response to the comparison. To accomplish this, the adaptive equalizer includes a feed forward equalizer receiving a signal from a communication channel, the feed forward equalizer equalizing variations in pre-cursor intersymbol interference resulting from changes in characteristics of the channel and providing an output signal to an error correction decoder, a decision circuit, coupled to the feed forward equalizer, for generating error vectors in response to the output signal of the feed forward equalizer and a decision feedback equalizer, coupled to the decision circuit, the decision feedback equalizer monitoring the pre-cursor intersymbol interference of the channel, determining when the transmitter coefficients to the pre-coder warrant updating, and generating a signal indicating that an update to the transmitter coefficients to the pre-coder is warranted. The adaptive equalizer further includes a comparison circuit, the comparison circuit receiving an output from the decision feedback equalizer and comparing the output from the decision feedback equalizer to a reference, the comparison circuit generating the signal indicating that an update to the transmitter coefficients to the pre-coder is warranted in response to the comparison.
PCT/US1998/004251 1997-03-06 1998-03-04 Adaptation of pre-equalisers WO1998039871A2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AU66850/98A AU6685098A (en) 1997-03-06 1998-03-04 Adaptive equalizers and methods for carrying out equalization with a precoded transmitter
EP98908943A EP0965207A2 (en) 1997-03-06 1998-03-04 Adaptation of pre-equialisers
CA002283200A CA2283200A1 (en) 1997-03-06 1998-03-04 Adaptive equalizers and methods for carrying out equalization with a precoded transmitter

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US3942097P 1997-03-06 1997-03-06
US60/039,420 1997-03-06
US09/033,770 1998-03-03
US09/033,770 US6167082A (en) 1997-03-06 1998-03-03 Adaptive equalizers and methods for carrying out equalization with a precoded transmitter

Publications (2)

Publication Number Publication Date
WO1998039871A2 WO1998039871A2 (en) 1998-09-11
WO1998039871A3 true WO1998039871A3 (en) 1998-12-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/004251 WO1998039871A2 (en) 1997-03-06 1998-03-04 Adaptation of pre-equalisers

Country Status (5)

Country Link
US (1) US6167082A (en)
EP (1) EP0965207A2 (en)
AU (1) AU6685098A (en)
CA (1) CA2283200A1 (en)
WO (1) WO1998039871A2 (en)

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US7505512B1 (en) * 2005-05-05 2009-03-17 Xilinx , Inc. Method and apparatus for combining statistical eye channel compliance methods with linear continuous-time equalization
US8279783B1 (en) * 2005-08-12 2012-10-02 Aquantia Corporation Linear-equivalent echo and next cancellers for Tomlinson-Harashima Precoding (THP) systems
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Also Published As

Publication number Publication date
US6167082A (en) 2000-12-26
AU6685098A (en) 1998-09-22
EP0965207A2 (en) 1999-12-22
CA2283200A1 (en) 1998-09-11
WO1998039871A2 (en) 1998-09-11

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